How I felt last weekend
This describes it pretty well. I’m a fan of web comics, so this ones now on my feed radar.
Thanks Keacher
Archive for April, 2008
OpenBSD, postgresql and semaphore failures during initdb
Today I upgraded my postgresql database instance on OpenBSD. Did a pg_dumpall, removed the old packages and then added the new ones (latest version 8.1.9 for OpenBSD 4.0 - yes I’m behind).
During the initialisation of the new DB, I got the following error:
creating directory /var/postgresql/data/pg_tblspc ... ok selecting default max_connections ... 10 selecting default shared_buffers ... 50 creating configuration files ... ok creating template1 database in /var/postgresql/data/base/1 ... FATAL: could not create semaphores: No space left on device DETAIL: Failed system call was semget(1, 17, 03600).
The PostgreSQL documentation talks about this extensively. However I don’t want to recompile my kernel away from default. What else can I do?
Coral Content Distributed network
Have you ever had your website hit on a topic that people find conflicting? When the site gets viewed by the masses, you need to be prepared. If you have access to modify your web server .htaccess file then go and have a read of the Coral CDN Overview
For those interested in the techie bits, here is my .htaccess for news site flood protection, and to allow CDN to serve up all my site images - thus offloading from my puny connection the bandwidth burden for images.
<ifmodule mod_rewrite.c>
RewriteEngine On
#prevent slashdot effect
RewriteCond %{HTTP_USER_AGENT} !^CoralWebPrx
RewriteCond %{HTTP_REFERER} blogspot\.com [NC,OR]
RewriteCond %{HTTP_REFERER} reddit\.com [NC,OR]
RewriteCond %{HTTP_REFERER} digg\.com [NC,OR]
RewriteCond %{HTTP_REFERER} news\.slashdot\.org [NC,OR]
RewriteCond %{HTTP_REFERER} slashdot\.org
RewriteRule ^(.*)$ http://techdebug.com.nyud.net/$1 [R,L]
#Rewrite images to allow CDN to serve them
RewriteCond %{HTTP_USER_AGENT} !^CoralWebPrx
RewriteRule ^(.*)/(.*\.(gif|png|jpe?g))$ http://techdebug.com.nyud.net/$1/$2 [R,L]
#Wordpress rewites
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</ifmodule>
mod_rewrite is your friend.
Wikipedia Article creates Circular references
A recent post on SlashDot quotes an IT professor saying:
People are unwittingly trusting the information they find on Wikipedia, yet experience has shown it can be wrong, incomplete, biased, or misleading
After reading this, I thought it was time to write about a something I found that backs this up. An anonymous user added information about Sacha Baron Cohen (known onscreen as Ali G.) to Wikipedia on November the 14th 2006. This entry added information about Baron Cohen working for investment bank Goldman Sachs prior to becoming famous as an actor.
Three days later, on November the 17th 2006 an article appeared in the Independent with the same information. The article included Baron Cohen’s career information almost as a footnote, at the end of the article - possibly using Wikipedia as the source of his “Goldman Sachs” career and other family information.
On November the 21st 2006 a second anonymous user added information to the Wikipedia entry on Baron Cohen that his early career included work at not only Goldman Sachs, but JP Morgan. Doing a lookup on this users IP address shows that it belongs to an address block allocated to JP Morgan Chase & Co! Someone at the company either new it to be true - or didn’t like the fact that he had been listed as working at a rival company; showing this addition as a potential one-upmanship entry.
A number of months later, a wikipedian actually did his homework, and on the 23rd February 2007 removed the bogus career information stating:
remove Goldman Sacks career as it is not mentioned in the Rolling Stone interview or anywhere else I can find
But it was too late. From 2007 onwards the Wikipedia entry detailing his career has been modified in an on again off again fashion. As of April 2008, the Independent and the Guardian are now used where still used (but have since been removed and discussed) as the source of the information - external references that exist outside Wikipedia - albeit written after the initial entry to Wikipedia. Since Wikipedia references used to referenced these articles as the source for this career move from investment banking to acting; it’s deemed permanent information.
The anonymous Wikipedia entries appear to have been “jokes”, or methods of associating famous people with a company - by financial industry insiders. Not only in the case of the initial change on 14 November, but also in the additional change by someone at JP Morgan on the 21st November, and subsequent additions, removals and swapping of big-time rival company names from Wikipedia.
The bottom line is that NO verifiable information existed anywhere on the internet that Baron Cohen worked for any investment banks (Goldman Sachs or JP Morgan) prior to the 14th November 2006. The only person that can tell us the truth now is Sacha Baron Cohen himself.
In February I wrote on the user talk page of the first “prankster” about this issue, but only recently has an another anonymous user commented over at SlashDot on this exact information of the same article - It could even be the same person who started this as they say:
It is now down to the rest of the world to prove that Sacha Baron Cohen DID NOT work for Goldman Sachs.
All of these thing show how easy is this to do. But how many other times has this been done? Is it the corporations, insiders or just people who work in related industries having a laugh. I’ll leave you with this (long) quote from anonymous@slashdot…
The real Wiki-vandals are the companies, governments and lobby groups of all sorts that flood Wikipedia with their squeaky clean corporate profiles (yes, corporate governments), whipped straight from their websites … These entities are the true threat to the laudable goal of Wikipedia to provide a freely accessible forum for the production and storage of (hopefully well-referenced) articles for the masses and a forum that does not restrict the privilege of contribution to those that have jumped through the all the right hoops. … The printed word is no more reliable than the plasma. Lies may be propagated on Wikipedia, but not without debate. Politicians spouting their sludge find their propaganda sitting side-by-side with those that mock them… If knowing that anything in a Wikipedia article is as likely to be crap as correct, the average reader becomes more vigilant in clicking through to the supporting sources; then Wikipedia has served the purpose of bringing to the masses the healthy skepticism that is, after all, the cornerstone of all academic pursuits.
Dark eyes look down from ivory towers. Do they cheer or do they fear?
Update 20 April: since I wrote about this, and got slash-dotted, Wikipedian editors (and numerous slash-dotters) have discussed this entire issue; and the general consensus of the editors is that these two external sources are no longer valid. I think my point was understood. This may only be the tip of the iceberg and it is up to people checking their Wikipedia information to verify first, or remove - and be conscious of timelines!
Telstra ADSL2 upgrade complete
Telstra announced yesterday that their ADSL 2+ (what’s with the plus?) upgrade has now been completed Australia wide. What does this give the average end user access to? The Telstra PR and discussion site explains:
The ADSL2+ upgrade of 907 telephone exchanges serving 2.4 million homes and businesses announced in February is now complete. This means millions of additional Australian families, businesses, non-profit organisations and government agencies across every state and territory can now enjoy the benefits of high-speed broadband
This is a double edged sword. On one side it is a good thing that this increases high speed access to the end user; on the other side its Telstra. Even though I am a Bigpond Cable user, I would not recommend Bigpond ADSL2 unless it was last resort - for a number of reasons;
- high price for data plans (AU$59.95 entry level ADSL2 for 600MB per month!);
- uploads count towards your monthly limit; and
- if you are not on a shaped (liberty) plan their excess price is AU$150 per GB.
These cons mean that a non tech person getting ADSL2 could start of with the entry level 600MB plan, spend a few days surfing YouTube and having clocked up, lets say 1.6GB of usage, would be up for AU$209.95 for their initial monthly cost, on top of installation and hardware costs.
But in some cases this is the only ADSL2 on offer where previously there was none, dialup or very expensive wireless. Before Telstra commenced the turn on they made sure that “the Government … made clear it did not consider a compelling case had been made for regulating third-party access to the service”. Other ISPs don’t think so, even though I have to side with Telstra on this one. They are in the money making business for their shareholders. If these networks were to be available for the people, then the government of the day should NOT have sold off Telstra, but left it as a public utility.
Bottom line: Despite this new capacity and services, cheap, fast broadband is still unobtainium in Australia if you don’t live in a Metropolitan location.
